Adjustable lamp



FIG. 1 is a top plan view of an adjustable lamp showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof.

The ornamental design for an adjustable lamp, as shown and described.